These colorful self-adhesive pocket envelopes are ideal for storing Hygloss flashcards and learning cards. You can also mount library pockets on the wall or bulletin board and use for attendance charts and job charts. And of course, the colorful pockets are terrific for library management. Hygloss Self-Adhesive Library pockets have pressure sensitive backing; just peel off protective layer and mount on the object of your choice! Pockets are made of durable text stock paper. They are acid free, fade resistant and accept all mediums.